PAM50 ER/HER2 normalization

Python code to apply the PAM50 gene normalization as in PMID 38546612: Tumor Intrinsic Subtypes and Gene Expression Signatures in Early-Stage ERBB2/HER2-Positive Breast Cancer: A Pooled Analysis of CALGB 40601, NeoALTTO, and NSABP B-41 Trials.